地铁深大基坑施工碳排放计算方法

Calculation Method of Carbon Emission in Metro Deep and Large Foundation Pit Construction

为助力我国“双碳”目标,并为地铁工程节能减排工作提供数据支撑,解决地铁深基坑工程施工阶段温室气体量化复杂繁琐的问题,基于全生命周期理论,建立地铁基坑工程施工阶段碳排放量模块化计算方法。考虑到地铁深基坑工程临时性的特点,将施工阶段碳排放量计算分为上游材料生产、基坑现场施工和材料运输3个阶段,并对北京城市副中心站综合交通枢纽工程02B基坑及坑中坑基坑施工过程中的温室气体排放量进行计算和分析。结果表明:1)02B基坑施工阶段排放二氧化碳20498.50 t,坑中坑基坑施工阶段排放二氧化碳32422.50 t,共排放二氧化碳52921.00 t;2)地铁深基坑工程施工阶段碳排放量与地铁深基坑施工方法和支护强度有关。

To promote China′s Carbon Peaking and Neutralization Policy,provide data support for energy conservation and emission reduction of metro projects,and address the complex and cumbersome problem of greenhouse gas quantification process in the construction stage of metro deep foundation pit engineering,a modular calculation method for carbon emissions in the construction stage of metro foundation pit engineering is established based on the whole life cycle theory.Due to the fact that the metro foundation pits are temporary,the carbon emission calculation process is divided into three stages:upstream material production,foundation pit site construction,and material transportation.Furthermore,the greenhouse gas emissions during construction process of the 02B foundation pit and the pit in pit of the Beijing City Sub-Central station comprehensive transportation hub project are calculated and analyzed.The results show that:(1)The CO2emitted during the construction stage of 02B foundation pit and the pit in pit reached 20498.50 t and 32422.50 t,respectively.(2)The carbon emission in the construction stage of the metro deep foundation pit project is related to the construction method and support strength of the metro deep foundation pit.